Mechanical horn.



O. C. ARLITZ'.

MECHANICAL HORN.

APPLICAHON man MAR.3, 1911.

Patentd Aug. 3, 1915.

ldfiaifld Til @FFEQE GSGAR C. ARLITZ, OF NEW YORK, N. Y., ASSIGNOR TC LOVELL-MGCONNELL MANUFAG- I TUBING COMPANY, A CORPORATION OF DELAWABE.

MECHANICAL "HORN.

Specification of Letters Patent.

Lll iidfiiii.

Application filed March 3, 1911.

and State of New York, have invented certain new and useful Improvements in Mechanical Horns, of which the following is a specification, reference being bad therein to the accompanying drawings, which form a part thereof.

My invention, relates to mechanical horns and more particularly to a type thereof em ploying a mechanically flexed diaphragm.

The main object of the invention is to provide a horn of this character wherein there will be a minimum of friction between the diaphragm stud and the impact member and the necessity of adjustment of these parts through wear is avoided.

The invention consists in the novel features of construction and combination of parts hereinafter set forth and described, and more particularlypointed out in the claim hereto appended.

Referring to the drawings z-Figure 1 is a side view of a horn embodying my invention, the outer casing being broken away to disclose the interior construction thereof; Fig. 2 is an enlarged perspective view showing a portion of the cooperating flexing mechanisms; and Fig. 3 is a side elevation of the mechanisms shown in Fig. 2 also upon an enlarged scale.

Like letters refer to like parts throughout the several views.

In the embodiment of the invention shown in the drawings, a indicates an ordinary horn casing having at the front thereof a sound outlet opening 6 communicating with a horn or amplifier 0. Mounted within the casing in the usual and well known manner, rearwardly of the sound outlet 6 is a flexible diaphragm (Z, preferably of steel, said diaphragm being so positioned within the casing a as to permit its free fiexure in either direction. The diaphragm d is pierced centrally thereof and firmly secured thereto is an impact stud 6 through which the diaphragm is flexed to develop sound waves of the desired frequency and volume.

lllountcd out of alinement with the stud on the diaphragm, and rotating upon a plane rmrallel with the diaphragm, is a disk 7 having a series of rises or impact members 9 thereon, said disk being rotated by means Patented Aug. 3, 1915. Serial No. 611,862.

of the electric motor it, or from any other source of power imparting high speed to said disk. The rises or impact members 9 are adapted to contact with the side of the stud e which stud is beveled or" rounded to cause a camming action through the engagement of said members g therewith. The disk f is spaced away from the diaphragm 03 sufficiently to afford a clear field of fiexure for the diaphragm, and the stud e is extended axially of the diaphragm so that, irrespective of the position of the diaphragm, said stud will be within the operative range of the members 9.

To minimize wear upon the members 9, I.

preferablv form said members of bearing balls secured in apertures in the periphery of the disk 7 by means of the rim plate 2', said plate being so set as to prevent too free a movement of the bearing balls. Said balls being hardened and movable, wear at this point is reduced to a minimum.

When the horn is operated the stud c is forced upwardly by the rapid impulses from the members 9, each upward thrust thereof tending to flex the diaphragm outwardly above the axis thereof and inwardly below said axis, thus causing the tension of said diaphragm on one side of its axis to be opposed to that of the other side thereof, which condition prevents the cupping actionabove referred to, and at the same time results in the rapid restoration of the diaphragm to normal after each impulse from one of the members 9. The sli 'ht tilting of the stud 6 under these impulses will present a slight bevel to the pitch of the balls forming the members g when the diaphragm is thus flexed. which results in a slight forward thrust of the diaphragm.

If residuary vibrations in the diaphragm tend to reciprocate the stud c, this stud will nevertheless be within the operative range of the impact members 7 at all times, and thus cause said diaphragm to be flexed with a constant frequency determined bythe number of members 9 and the speed of r0- tation of the disk 7".

A horn such as I have described will develop sound waves of a varying volume by reason of the fact that the leverage at which the members 9 act varies with the position of the diaphragm, the signal developed be ing a pulsating signal of eccentric character.

To prevent the double flexing of the dia ing apparent phragm from weakening it at its center, I provide reinforcing plates or washers'j In,

about saidc'enter and thestud e, which plates or washers afford a sufficient contact area operative upon the'diaphragm to avoid the. this breaking down of the diaphragm at point.

It is not my intention to limit the invention to the precise details of construction shown in the accompanying drawings, it bethat such are largely matters of design and capable of variation without departing from the spirit or scope of the invention. a

Having described my invention, what I claim 'as new and desire to have protected by projection carried thereby,

Letters Patent, is

A horn including a flexible diaphragm, a a shaft presented Copies of this patent may be obtained for OSCAR G. ARLITZ.

Witnesses: i

F. T. WENTWORTH, EUGENE WENING.

five cents each, by addressing the Commissioner of Patents, Washington, D. G. 1

therefrom but prevent- 

